Chamfering the flank edges of spur and helical cylindrical gears prevents edge distortion during heat treatment and protects the tooth profile against any nicks that may occur during handling.
A burr which is not removed may break off during use and damage bearings or gears in gearboxes.
Over-carbonizing may result in too much pressure being exerted on sharp gear lateral surfaces which might then break. A hardened burr may lead to premature wear of tools in subsequent finishing operations. Removal of very sharp burrs reduces the risk of tool handling injuries.
Chamfer, deburring and rolling tools are available as combination tools in set of various combinations.